/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.IOException;
import java.util.*;

import org.apache.hadoop.io.*;
import org.apache.hadoop.mapred.*;
import org.apache.hadoop.util.*;

public class Deducer extends MapReduceBase implements Reducer<Text, Text, Text, Text> {

  public void reduce(Text key, Iterator<Text> values, 
      OutputCollector<Text, Text> output, Reporter reporter) throws IOException {
    Set<String> attackers = new TreeSet<String>();
    while (values.hasNext()) {
      String valStr = values.next().toString();
      attackers.add(valStr);
    }
    output.collect(key, new Text(attackers.toString()));
  }
}

